Vibration dampener



Jan. l2, 1932. Q BREER 1,840,656

VIBRATION DAMPENER Filed June 25, 1927 Blf/AHL BQEER ATTORNEY @attentati 1.2, 1932- naar. or ramon', MICHIGAN; AssIeNon To cnnrsnna conroaarxon, or

HIGHLAND PARK, MICHIGAN, A CORPORATION F .DELAWARE A VIBRATION IDMPIENER .Application fled, .unel 25, 192'?. ASerial No. 201,545.

This invention relates to a vibration dampener and more particularly a vibration dampener for use on a crankshaft of an internal combustion engine for eliminating certain torsional vibration thereof.

. An important object of the invention is to provide a dampener in which a slip ing inertia ring is frictionall engaged an rotated by the crankshaft an -the amount of frictional grip is varied in proportion to the speed of the crankshaft.

Another object of the invention is to provide a continuous adapted for expansion by its centrifug force, to urge an inertia `member into frictional enga ement with a rotating member on the cran haft. A vfurther object is to provide a vibration dampening device of `slmple construction which is cheap and durable and one which 20 operates to dampen all riods of vibration. Other objects and a vantages will more fully appear from' the following descriptwn taken 1n connection with the accompanying drawings in which: c

- is F' 1 is a side elevation of a crankshaft and ywheel embodying my invention. Fig.2 is an end view of the dampener, parts being broken away.' L

taken on line 3-3 Fig. 3 is of F1?. 2.

.Re erring to an embodiment of my invention aft 10 has benshown providedwith a flywheel `12 at one end thereci and a dampener A at the other end there, \85 o o I l The dampener A comprises a hub member 14'secured to the crankshaft 10, as by the keg- 16, and adapted to rotate therewith. The hu a sectional view 14 is provided with a radial integral plate portion or iiange 18 which ma be grooved as at 20 to form a fan belt `p ey. Another radial plate 22 is secured tothe hub 14 b bolts 24 forming an annular groove 26.

pair of -inertia rings 28 are mounted in thef annular groove 26 and rings 30, of friction Vmaterial, are arranged between the opposite faces of the plates18 and 22 and the rings 28.

A- means has been provided vbetween the inertiaA members p adapted.A :to urge them against the friction rings 30"and in order to Yweight and corrosion are to lbe considered,

tion, is triangular with its two sides'tapered and so arranged as to produce a wedging ac.- tion between `the two rings 28 when it expands radially. Y

The ring is preferably made of a homogeneous composition of rubber and a metal. f The rubber content permitsthe to expand and the metal gives it weight to increase the centrifugal force of the rotating ring. Rubber has v a specific v it'y of 1.2. While it is elastic to permit expansion it is not heavy enough. Lead oxide, for exannle, has a specific gravity of 9.4 and when ed to the rubber, a homogenous composition `is formed whichris heavy and yet elastic. It has been found that a composition of equal parts lead and rubber forms a desirableI ring havin a specific gravity of about 5. It is to -be un erstood that other metals may be used in lace of lead, such as iron, copper, brass, mckel, tin, zinc et cetera but cost,

and lead voxide has been found to be the most satisfactory. p

The outer periphery of the ring 32 is provided with' a metallic ring 34 which protects the ring at the point between the inertia members, where it might otherwise'be exposed to lubricant or dirt. Y

The ringsv are provided with alternate aligned recesses'36 and aligned openings 38. Sprin s -40 are receivedrin the recesses36 to -initial y urge the rings apart against the friction faces and pins 42 prevent independent rotation of` the'rings with respectto each other. u Y

In the operation of my device, the crank- 1W lill shaft when rotating slowly, carries with it the inertia rings 28 and the composition' rings 32; therings beingpermitted to readily slip with respect to the crankshaft .dampenin out the vibrations occuring at that speed. at I claim is: x

1. A vibration dampener v comprising in combination a rotatableymember, an inertia member rotatable relatively thereto adapted for frictional engagement with said rotatable member, a member adjacent said inertia member and a continuous expansible ring having lateral surfaces between'said inertia member and the member adjacent thereto adapted to urge said inertia member into frictional engagement with said rotatable member by the expansion of said ring, the ring being adapted to vary the amount of frictional engagement in a proportion to the speed of rotation of said rotatable member. 2. A vibration dampener comprisin in combination a rotatable'member, space inertia members rotatable relatively thereto and adapted for frictional engagement with said rotatable member, and a continuous expansible ring between said inertia members adapted to separate said inertia members by the expansion of said ring to vary the amount of frictional engagement between said nertia members and said totatable member.

3. A vibration dampener comprising 'in' lcombination a rotatable member having a pair of separated plates', spaced inertia members between said plates rotatable relatively thereto and adapted for frictional engagement therewith, anda continuous inertia ring between said inertia members adapted for expansion by centrifugal force and having surfaces in contact with each of said inertia members, and means for preventing radial expansion of the outer surface of said ring whereby said ring is expanded to move said inertia members axially for varying the amount of frictional engagement between said inertia members and said separated plates proportionate to its speed of rotation. 4. A vibration dampener comprising in combination a rotatable member having a pair of radial plates, a two art inertia mem-l ber having faces adapted or frictional engagement with said radial plates, and a'ring composed of rubber and a metal arranged between said inertia member parts, said ring having tapered surfaces in contact with said inertia member parts.

' 5. A vibration dampener comprising in combination a rotatable member having a:

pair of spaced radial plates, spaced inertia members between said plates for frictional engagement therewith to form a driving connection between said members, and a continuous expansible ring having tapered sides between and in engagement with said inertia members to produce a wedging action due to centrifugal force when the members are l I Y 6. An article of manufacture which con\ sists of .an annularexpansible ring having a homogeneous com osition of rubber and a; metal, and an ann ar metallic band around l the .outer periphery of said rin to prevent radial expansion b the actionl o centrifugal force, said ring being free for lateral expansion.

7. A vibration dampener comprising in combination, a rotatable member, an inertia member relatively rotatable therewith, a member adjacent said inertia member, an eX- pansible inertia ring composed of rubber and a metal arranged between said inertia member and said member adjacent thereto to urge said inertia member into. frictional engagement with said rotatable member by the expansionof said ring, and a metallic band around the outer periphery of said ring to prevent radial expansion of said ring by the action of centrifugal force, said ring being free for lateral expansion.'

8. A vibration dampenercomprising in combination, a rotatable-member, an inertia member relatively, rotatable therewith, a member adjacent to said inertia member, an expansible inertia ring arranged between said inertia member and the member adjacent thereto to urge said inertia member into frictional engagement with said rotatable member by the expansion of said ring, and means. around the outer periphery of said ring to prevent radial expansion of said ring by the action of centrifugal force, said ringl 

